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Thread ID: 102946	2009-09-07 07:27:00	UHF amp	ubergeek85 (131)	PC World Chat

Post ID	Timestamp	Content	User
807627	2009-09-07 07:54:00	Thus, why I wanted to use MOSFETs... Surely the only (main) difference between a car audio amp and an RF amp is the freq it is designed for?	ubergeek85 (131)
807628	2009-09-07 07:56:00	Talk to BillyT and/or GrahamL - they're probably the most knowledgeable about this sort of stuff here.	somebody (208)
807629	2009-09-07 08:04:00	Thus, why I wanted to use MOSFETs... Surely the only (main) difference between a car audio amp and an RF amp is the freq it is designed for? There is a wee bit of a difference between 12,000 Hz. and 700,000,000 Hz. (There is a bit less difference between a torch battery and a 230 volt supply.) A volcano and a firework differ mainly in scale, but the side effects go a little deeper ;) UHF is "Interesting" when you can use short lengths of wire as insulators. This causes unusual effects when you have what appears to be short leads on capacitors that stop them having the capacity to do what you wish. It can lead to some interesting study, but it is not quite such a trivial exercise as it appears at first glance. Good fun though.	R2x1 (4628)
807630	2009-09-07 08:07:00	I see...	ubergeek85 (131)
807631	2009-09-07 09:09:00	Yeah, it was a bit of a long shot... I was planning on something like this (www.instructables.com) Yeah that isn't such a smart idea here - unlike the US, our analogue channels are still live. Even in the US, it's not smart - you'd still get some pretty bad consequences. It seems you have some experience with this... Not personally - I just have commonsense and some relevant knowledge. to add, i've known a few illegal ones that where running for years, but also know of ones that got found out and had all the gear confiscated. they where also a lot lower powered than what your thinking of doing. by memory they lost all the amps, solar panels, batteries etc. we are talking fairly substantial $$$ worth. no one was prosecuted simply because no one owned up to owning the gear. i was involved many years ago in building one (legally) and had a certain level of power to keep under, transmission range etc. it also had a yearly fee for the license. high powered ones tend to cause interference for a very long range which is how they get found out. i've even had video extenders which i've picked up and tracked back from over 2km away.	tweak'e (69)
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